I got the big MTC , 15 years old , pump may fall , great C.R. but i decide to replace it, i just order one , is on sale, i like the idea NOT to deal with 20 screws , when add or clean , i order next size i provide the link ( 8") for you 7" may do the trick.
I had the procal on my 150g. I was able to swap for a MTC mini cal when i down graded to a 90g. Both work great. i did recently change the pump on the mini cal but its been running for 10+ years (might have changed it once before??). Im just getting back into the sps game but it has been keeping my levels very stable. Vio is rigth the 20+ screws are a Pain.
Of course i will , NOT give up in my old MTC , help me a lot , i just want to try some dif one, i may be wrong , list i try, i order also APEX to control the CO2 digital regulator , let's see. My goal is ,,,,,,,,NOT to depend 100% of Calcium Reactor, i got also Vertex Libra ( great dosser, i was one of few i buy it , when they release ) I try to introduce less CO2 is possible, my Protein Skimmer ( air intake ) is tide up from outside, my PH is 8.1 to 8.2 , super happy . My Calcium Reactor ( MTC ) run on idle , i like that.